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71 Chevy AC troubleshooting question

xprmntl1 on Wed August 06, 2008 12:50 PM User is offline

Year: 1971
Make: Chevrolet
Model: Cheyenne
Engine Size: 350
Refrigerant Type: Freeze 12
Ambient Temp: 95
Pressure Low: ??
Pressure High: ?
Country of Origin: United States

I had my system recharged last summer but it really never got cold afterwards. While idling the compressor never kicks off, but the lower tube coming out of the evaperator is super cold and condensation is dripping, but the vents blow just less than cool. I know the heater core is still getting hot, is this my problem? I know the door between the heater and the AC is on the AC side.

Any help is much appreciated!

xprmntl1 on Wed August 06, 2008 1:17 PM User is offline

Well, I bypassed the heater core and it still isnt blowing cold air. Should the top and bottom tubes to the evaperator be cold, because the top isnt and the bottom is dripping with condensation it is so cold...

mk378 on Wed August 06, 2008 1:32 PM User is offline

The pipe from the evaporator to the compressor is not getting cold, but the inlet between the TXV and the evaporator is? That could be a low refrigerant charge situation. Need to measure the pressures next.

I think you have a POA system which means the compressor normally will not cycle.

Realize that Freeze-12 is based on R-134a, performance will be similar to using pure R-134a. The fan clutch needs to be in top condition if you hope to get any good cooling with the stock condenser and R-134a.

Edited: Wed August 06, 2008 at 1:33 PM by mk378

johnboy123 on Thu August 07, 2008 11:42 AM User is offlineView users profile

it may be that you have a blend door problem - first check your vacuum line going into the cabin - there will be a black vacuum line going into the fire wall next to your evaporator box. in many cases they either break or the rubber gets old and cracks at your supply source. if that is in good shape - behind the radio and control head is the blend door module you are looking for - it is the one that separates the heat from the cold - you can operate it by hand and see if that makes a difference - there is a chance that it will need to be replaced - good luck

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